Question about 1998 GMC Sierra

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2000 gmc 2500 pickup heater fan works good but not a lot of air

Moves thru the vents the defroster moves more air but the dash vent dont work well at all floor heat not great truck temp 210 everything seems to work just not much air movement

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Http://www.fixya.com/cars/t1386554-91_ford Please read this post, I hope it will help you.

Posted on Dec 22, 2008

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Usually a sign of a faulty blend door under the dash.
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If both heater hoses are hot, and the radiator is full of coolant, it may be a blend door problem under the dash.
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AC will not blow out of the dash vents, only the defroster vents or heater vents. Can I access the vent door underneath the dash?vents


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Jun 06, 2012 | 1991 Chevrolet Silverado 2500

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1995 GMC pickup. Cold AC will blow through all settings (defrost, front vents and flloor) but warm air will not come out the defrost. You can hear something click in the dash that you assume is some kind...


good work, the clicking noise you hear is the blend door trying to move. this door is what controls the temp. the most common reason is the actuator motor is bad but sometimes the door hinge breaks, this hinge slides into actuator and is used to move the door. you will need to locate it on the heater box by locating the noise and then remove the actuator and see if the hinge is broken, i will try to enclose some picture to help you. good day, hope this helps.johnjohn2_142.jpgjohnjohn2_160.gif

Sep 24, 2011 | 1995 GMC Sierra C1500

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It is a vent door actuator motor on top of the blower box,the dash has to be removed and set in the seats to replace the actuator motor.Cost for the part is about 50.00 dollars

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1 Answer

Air blows out thru the vents but just no hot air, aslo i have to hit the dash for the air to come out thru the dash vents at times.


sounds like bad acuator motor, this is what moves the door in heater box to set hot or cold air, and other motors to set air to blow thru defrost, vent or floor. good luck.

Oct 10, 2009 | 1999 Chevrolet Silverado 1500

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